直接答案 Quick Answer
YT23、YT24、YT27、YT28、YT29A和YT29B都是气腿式产品线。选型应先收集岩性、孔径、孔深、作业方向、现场空间和供气条件，再用已核实参数缩小范围，不能只按型号数字大小判断。 YT23, YT24, YT27, YT28, YT29A and YT29B are air-leg models. Establish rock, hole diameter/depth, direction, space and air supply, then narrow the range with verified data—not the model number alone.
现有参数怎样使用 Using the available specifications
YT23、YT27、YT28、YT29A和YT29B已有重量、长度、参考孔径、耗气量、冲击频率和钎尾资料；YT24仍有多项需要下单前确认。未知信息应保持未知，不用其他型号的数据代替。 YT23, YT27, YT28, YT29A and YT29B have weight, length, diameter, consumption, frequency and shank data. Several YT24 items still require confirmation; do not substitute another model’s figures.
询价前的统一清单 A shared inquiry checklist
同一型号在不同配置和批次下可能需要不同配套确认。采购方应把现场条件与所需附件一次性提供。 Configuration and batch differences may affect accessories for the same model. Provide site conditions and the required accessories together.
- 岩性、目标孔径和孔深 Rock, target hole diameter and depth
- 作业方向与现场空间 Drilling direction and site space
- 供气条件和同时开机数量 Air supply and simultaneous drill count
- 意向型号、数量和配套件 Preferred model, quantity and accessories
- 需要核对的铭牌、说明书和包装 Nameplate, manual and packaging to verify